LED and LCD TV MCQs | LED and LCD TV Multiple Choice Questions and Answers

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Questions
1 The full form of LCD is ____________
A Logical Crystalline Display
B Liquid Crystalline Display
C Logical Crystal Display
D Liquid Crystal Display

Answer: Liquid Crystal Display
2 By which properties, the orientation of molecules in a layer of liquid crystals can be changed?
A Electric field
B Gallois field
C Electromagnetic field
D Magnetic field

Answer: Electric field
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3 The direction of electric field in an LCD is determined by ___________
A Quantum Cellular Automata
B Crystalline surface structure
C Molecular Orbital Theory
D the molecule’s chemical structure

Answer: the molecule’s chemical structure
4 LCDs operate from a frequency ranges from ___________
A 30Hz to 60Hz
B 50Hz to 70Hz
C 10Hz to 60Hz
D None of these

Answer: 30Hz to 60Hz
5 What is backplane in LCD?
A For adjusting the intensity of the LCD
B The dc voltage applied between segment and a common element
C The amount of power consumed
D The ac voltage applied between segment and a common element

Answer: The ac voltage applied between segment and a common element
6 The reverse bias in the semiconducting devices will
A Make the potential barrier zero
B Not affect the potential barrier
C Decrease the potential barrier
D Increase the potential barrier

Answer: Increase the potential barrier
7 MOSFET is
A A voltage-driven device
B A power driven device
C A low input impedance
D A current-driven device

Answer: A voltage-driven device
8 Which of the following device is the best for improving switching speeds of bipolar transistors?
A Clamping diode with zero storage time
B Clamping diode
C Speed-up capacitor
D Transistor with higher cut-off frequency

Answer: Clamping diode with zero storage time
9 Which of the following displays has minimum power consumption?
A Liquid crystal display (LCD)
B Light emitting diode (LED)
C Fluorescent
D Nixie tubes

Answer: Liquid crystal display (LCD)
10 The output offset of an operational amplifier is attributed to
A An input current offers
B An input-voltage offset
C Either (a) or (b)
D None of these

Answer: Either (a) or (b)
11 Which of the following is the most negative (or least positive) electrode is the electron gun?
A Cathode
B Control grid G1
C Focus grid
D Screen grid

Answer: Control grid G1
12 Most of the electrons in the beam flow out of which terminal?
A Ultor or anode
B Cathode
C Ultor
D Anode

Answer: Ultor or anode
13 In which method in a G3 voltage of 200 V. used for?
A high-voltage focus
B low-voltage focus
C either low or high voltage focus
D none of these

Answer: low-voltage focus
14 Small magnets embedded in the yoke housing is correct for ____________.
A pinoushion distortion
B magnetic deflection
C yoke position
D centering adjustments

Answer: pinoushion distortion
15 In color picture tube, degaussing is done with .
A 60 Hz alternating current
B alternating current
C direct current
D 90 Hz alternating current

Answer: 60 Hz alternating current
16 In color picture tube, what does a solid red raster checked for?
A Resetting the yoke
B Convergence
C Degaussing
D good color purity

Answer: good color purity
17 Where do the small, white dots in the picture used for?
A convergence
B Resetting the yoke
C good color purity
D Degaussing

Answer: convergence
18 Where the permanent magnets used?
A resetting the yoke
B dynamic convergence
C automatic degaussing
D static convergence

Answer: static convergence
19 In picture, the basic waveform for dynamic convergence is the ____________.
A parabola or half of sine wave
B full sine wave
C parabola
D half a sine wave

Answer: parabola or half of sine wave
20 MOSFETs are suitably used where source resistance ranges from
A 10 to 100 MΩ
B A few ohms to thousand ohms
C 100 MΩ and above
D Milliohms to a few ohms

Answer: 100 MΩ and above

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